Multivariate MOF-303/MIL-160 balancing the trade-off between capacity and selectivity in CO₂/CH₄ separation.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Porous adsorbents are crucial for energy-efficient gas separation.
• A key challenge is the trade-off between adsorption capacity and selectivity, limiting industrial applications.
• Metal-organic frameworks (MOFs) offer tunable properties for gas separation.

Purpose of the Study:

• To synthesize a multivariate Al-based MOF for improved CO2/CH4 separation.
• To address the capacity-selectivity trade-off in gas separation materials.
• To leverage reticular chemistry for targeted material design.

Main Methods:

• Synthesis of a multivariate Al-based MOF, MOF-303/MIL-160.
• Incorporation of 3,5-pyrazoledicarboxylic acid (ligand of MOF-303) and 2,5-furandicarboxylic acid (ligand of MIL-160) in a 1:0.51 ratio.
• Evaluation of the MOF's performance in CO2/CH4 separation.

Main Results:

• MOF-303/MIL-160 successfully combines ligands from MOF-303 (high capacity, low selectivity) and MIL-160 (low capacity, high selectivity).
• The multivariate MOF achieves a balanced performance, overcoming the inherent trade-off between capacity and selectivity.
• Demonstrated enhanced CO2/CH4 separation capabilities.

Conclusions:

• The multivariate MOF-303/MIL-160 effectively balances adsorption capacity and selectivity for CO2/CH4 separation.
• This approach offers a viable strategy for designing advanced porous materials for energy-efficient gas separation.
• The study highlights the potential of reticular chemistry in creating tailored MOFs for industrial gas separation challenges.